Monster Association Headquarters

Location from One-Punch Man by ONE & Yusuke Murata

An underground fortress beneath Z-City — where the organized monster army planned their war on humanity before the heroes came knocking.

Also known as: Monster Association HQ, MA Base

What They Know

• Underground tunnel network connecting to Z-City's surface through multiple exits
• The structure housed dozens of Demon and Dragon-level monsters in separate chambers
• Orochi's throne room was the deepest level — reaching it required fighting through multiple defenses

Connections

• ruled_by — orochi
• part_of — z_city
• includes — gouketsu

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